Hydraulic transmission mechanism



April 18, 1933. (5,15, ZAHN 1,904,811

HYDRAULIC TRANSMISSION MECHANISM Filed Dec. 27, 1930 3 Sheets-Sheet l 61E. Zahw INVENTOR April 18, 1933. G, E. ZAHN I 1,904,811

HYDRAULIC TRANSMISSION MECHANISM Filed Dec, 27, 1950 5 Sheets-Sheet 2 4 .E.Za7277/ 142 Anoma y April 18, 1933. G. E. ZAHN HYDRAULIC TRAN SMISS ION MECHANISM F iled Dec. 27. 1950 V3 Sheets-Sheet 3 INVENTOR A E ATTORNEw in W')' M & ML

able 21nd eflicient andwhich iney'be manii-"f featured and sold jet"ajjconiparetivelx Patented Apr. 18,1933 I j l GEORGE; meantime b FR E M E N Y MEL This invention relate s to improvements in rotary pistons for hydraulictransmissions,

sion'sf of the type forming th e silbj ect majte teriof' iny neo-pending'iapplication fi1edfSep= r tember 9, 1929; and SIiELL NO. 391,263, and

hes for the primary objject,"th e provisionof a device ofthe abovestatedfcharacter which is rotatably mounted inthe eccentric chain 0 her ofthe transmissionfor theiwings o'f-the drive member wengage to reduce frictionto a minimumI whenlthe fdriven tdevice ijsidlingmekitive tojthe power shaft or rot'at ing' at a slower rate of speed'than the "power: shaft and whiclifwill festablisha direct drive;

connection between thedrive member or the wings thereof end the driven member when the pressure has been built up s iflielent to; bind the. piston g insmhe wells-of; the; eccentric chamber forming {apart of the driv ennierhber. I Another objeot-"of provision of a deviceofthe' aboves'tated nection with any device emplofyi for the pi rpose of reducing minimum.

A further object of this invention is' the provision'of a fluid transmission of the above Cost- With these an dl otheriobjects tion and errangernenthoffpartsLas will he. hereinafter more claimed.

org complete understendingloi vention reference isto he had to' the follow ing description and eccompanyingfirawings,

:in which I I ance with my invention. i: I

fifl taken on the line of Figilr 1 lustratingone endof thefcasingi n Referring indetil to thedrawinggtheq this invention fi s the 1 character which may be -'employedfin' con 'ng'e rot'or riction to '21 e v 1 from theinterlorofthecaslng -Wear plates 9 are located against;the side-walls o'f the casing andere providediwith arcuategs'haped 1 fully Qdes ibed, and

Figure I is a, sectional viewil'lustrating a fiuld transmission 1 constructed in accord Figure af section el ifiewitekenl ion brakes, pumps and the j li'ke; ='enditrsjrismis Figure 4;. isla, sectional{lview ttlienfon tlie v l lhnea'H fof FigureQi tratin e portionpf thedriving'elementud5 flFigure 7; is atransverse sectional numeral l. indicatesi-ari hoiising or casing? V which is suitably connected-Lto a device :to bei, C F driven andhas avre novablel sidewsll2 dea-fy tachably securedgby afasteners 3toian amid-{3 5 1 lar flanges: on thecasi'ngen'd thecasinghils formed; therein an: eccentric T c gliailnloer.{iii-as y clearlyyshow'n "inJFiQUreQv "ThesidefiwallsQ of thecaLsing 1 are'pfovided withiconeentri i cally located; ournals drive or power shaft suitahle stiiifing-y boxes 8; are provided between the shaft "Z 2 and the journals '6 to provide a leak-proof; i

connection betweenthe driven casing and 7 f ports '10 communicating w ithbypass 8 hers lilviand portsfl11'ff0rmedon the xt iony p i h ndiplates or walls of the" 09s will become more apparent "as thede igii walls 13 secured'rtotheshaft 7 withinzth 85'; '7 tion proceeds, the inventim i 1 tam novel features of constructlonicombma'r -1ng l sockets 151 0 I receive" rounded t end 16 V iwi-ngs 17.1 The Wings :17 rhaveih i free. I x S' e 0 provide ybitingc nds-41359053:

anmilar for engagement with an annular drive :pis-' ton orri'ngi19locatedagainstthe'inneriwalli i of the casing l or withinthe eccentric; charm-i her 5. Thewings' l7fareimollnted rfor free pivotal movement andz their: biting. ends 18 5 engege notches or 'g'ro'oves 20ftformed in the;

P 130110! ring'19 during 'certa'iin operations f. of the devicewByreferenc t iFi 2 it;

7 will be seen? that a plurality of igroovesi or notc'hes 20iiareiprovided -onithe inner pee-Him":

': 1Fig'l1re', 5 is? 9,- detail 'ectionalview illusi 53 riphery of the piston or ring 19 and extend parallel'with the axis thereof. Anti-friction means 21 which may be in the form of balls,

rollers or a film of fluid, is interposed between the outer periphery of the piston or ring 19 and the eccentric wall of the chamber 5, thus it Willbe seen that the piston or ring19 may have a floating action within the chamber 5 or rotate freely relative to the casing 1 when the latter is idle. v

The end Walls '13 of the drive member 12 are provided with ports 22 which communicate with the interior of the by-pass chamb'ers 11 by suitable ports lOand 11 intthe wear plates 9 and by-pass chambers l l for controlled by a 'slidable andcylindrical. shaped valve 24 locatedwvithin the. drive member 12 and is splined to the drive member 12 by a key .25 so that the valve will rotate with the drive member 12 from the power shaft 7. By adjusting the valve .24 relative to the ports 23', the'passagegof fluid through said ports can be regulated andthe' valve is connected to a member 26 which ex"- tends through a slot 27 in the shaft 7 and is; connected to a rod 28 slidably mounted in a bore of the shaft 7 and isprovided atits. outer end with ahead 29 journalled between spaced flanges 30 formed on a-"collar 81 journalled and slidably mounted'on a sleeve '32 forming a part of one of the journals 6.

The collar 31 isof the grooved type to which a suitableoperating means of the. manual control type; may be connectedforo the purpose of varying the position of thevalve 24 relative to the ports 28. A stuffing gland 33 engages therod 28 and islocated in the bore of the shaft 7 for .thepurpose of establishing a leak-proof connection be-' tween the rod 28 and the shaft 7. (The bar 26' has its ends seatedwithin a groove formed inthe valve 24 and'is retained in the groove by a removable plate 3a.

When it is desired that'the casing -1 idle I relative-to the power shaft 7 during the lat- 'ters rotation, the valve 24is positioned to permit the free passage or circulation of the-:1 fluid through the ports 23 thereby-prevent ing the pressure between certain of thewings from being built up and the piston'or rlng member 19 rotates freely within the chain. her 5 and to cause arotation of the casing.

1 at the same rate of speed with the shaft 7 or to cause the casing 1 to rotate in unison with the shaft 7 the valve is positioned .to 1 "close the-ports 23 causing fluid to be trapped between a certain pair of wings 17 and the drive member and walls of the chamber 5, which trapped fluid exerts pressure in all. directions and will bind the piston or ring 19 against the wall of the chamber 5 causing the casing 1 to rotate in unison with the shaft 7. To. rotate the casing l au a less number of revolutions per minute than the revolutions of the shaft 7, the valve 24; is positioned to partially open the'ports 23 permitting acertain amount of fluid to pass therethroughwhichreduces the pressure of the trapped fluid between certain of the win s17 thereby allowing a certain amount of s ippage between the piston 19 and the casing 1;

'referenceflto Figure 2 it will be seen that the device rotates in a counter clockwise direction and the two lowermost wings which are inengagement with the notches. 20 of the piston or ring .19 formachamb'er in which the fluid pressure is built up.

When thecasing -1 isidle or rotating at aslower rate-ofspeedthan the shaft; 7 thepiston or ring 19 moves faster than the shaft 7 owing tol-the arrangement of-thewings with-inthe eccentric. chamberv 5. It :will be noted: that the wing Awhich is the lower most wing of the group ofwings in Figure:

2 moves in the arc lofa circle when advancing from the positionshown'in Figure 2 to the position as shownat B which causes the piston or ring 19 to rotate or, advance a little more rapidlygthan the shaft. 7 The wing vA in the positionshown in Figure 2' occupies a position wherein the free end is disposed a greater distance outwardly than the free ends of the remainingwings andv asj'this respective wing advancestoward theposition B the free endv thereof swings'inwardly and this'inward movement causes a faster rotation of the ring or piston 19 than the rotation of the shaft v7 consequently. the remaining .wingsyratohet overithe. ring or {piston or slightly; lag behind the rotation. ofthe ring or piston. By reference. toFigure 2 it will .be seen that the up. permost wings are forced inwardly and lie in close proximity to .the outer periphery of the drive member 12 and as therespective wings arrive opposite to the arcuate-shaped ports 10 owin' to centrifugal force and the shapeiof thee amber'5 swing outwardly of the drive member 12and engage in a notch or groove 20 when arriving at the position occupiedby the Wing A in Figure 2 permitting fluid to enter from the ports 10 and 11 and be trapped between a pair of wings and thewalls of the device and with the valve 24 in an open position the trapped fluid may pass through the respective port 23 and prevent'pressure from being built up. However should the valve be closed the fluid trapped is then compressed establishing the necessary force tobind the ringer piston sa een 19 against the wall of the chamber 5 and cause rotation. of thecaSing 1 1n umson is that the piston "or ring 19 moves-faster, than the drivel member 12 when the casing 1 rotating at a slower'rateof speed than the power shaft 7 or when idling relative to the shaft 7. The free ends of the wing at the position A and the wing at theposltion B as shown in Figure 2, are further apart than-the ends of any other two successive wings in the circle so that as the wing at the position A and the wing occupyingthe pos tion B advance, the free end of the wingat the position A will havetravelled farther" than the free end of any ofthe other wings;

thusit is evident that the other wings lag "back of the advancing piston or ring'19 and continue to lag backuntil they reach the position occupied by thewing atthe position 'A in Figure 2 and then take their turn at advancing said iston or'rin whlch provides a two fold a vantage in t at the compression area is alwaysfrom the farthest open wing forwardly which causes a maxi mum pressure area dividing the load over the greatest possible bearing surface and .also releases the load on the preceding wings allowingthemto lagback to a point 36opening outwardly through one end non-movable pistons 37 carried by one o the endwalls of the where they engage with a minimum of wear. From the foregoing it will be seen that friction is reduced to a minimum by the employment of the rotating ring or piston 19. To render the device automatic forthe purpose of rotating thecasing lat the same rate-of sp'eed as the power shaft 7, up to a predetermined load or resistance on the casing 1, a control '35 is provided and the valve 24 isprovided with a plurality of cylinders thereof and receivin drive member 12 and theinner ends'of the cylinders 36 communicate with passages 38 leading to the interior of the drive member 12 adjacent the ports'23 for the purpose of admitting fluid pressure within the cylinderslinpaccordance with the fluid pressure within the drive, member 12 and that passing through the ports 23; A tension spring 39 forminga part of the control bears" against theflanges 30 of the collar 31' and against an adjustablehead 40 carried by a support 41 secured to the sleeve or extension 32 The head 4( is secured to an adjusting bolt 42 having threaded engagement'with ithe support t' il: 'e'whereby tension er spring; 39; may 1be varied)" The spring 539 is adjusted '-*to withstandflfia;certain pressure 7 Y which isI-equal toaf predetermi'ned' resistance on-load on the-member :1- and when; the i'loa'd or resistance oriftlie member 1increass be the determined amount; thesiipressure oflthe fluid ftrapped within the chamber icon fined't'byiLthe irespective pair-ifofywings and i i wallsof the device increases, the sanie pres sure will be againsttheq'pistonsBZ byway Off the passages 38 causln'gl an endwise move;

menltYof theqvalve? 24 increasing thegsize of theaports" 23 and allowing a grea ter; amount K of; fluid to escape therethrough, 1 therebyJTe j V A.

dyeing; the) ipressuret off'the ring! "or pist'on: againstg' t'he walls of the chamber 5 andfper the rloa'd or resistance: decreasesgto the predetermined samount kthe spring :39&moves the valve-24* infani opposite' direction :againi re-' ttardirigi; the flow-j of the; fluid-1 through -the port's r123. land ermitti g; =the'= desired pres sure to i-bei. again 1 builtI 111p between "the reg spIective"xwingsi and l walls? en e 'device :to

, {is ihave lfsfhown l at preferred embodiment of'; my: invention it 'mittingLa-slippageg betweenQsaidiparts and, f slower z rotat-iont .of :th e:- casing 1; and when" will; ebeglunderstbod that minorj changes '1 in 1 I constructioiflfcoiiibination 1 and arrangement of parts maybe made wthout" departing Having thus described my mamma from the spiritand'scope asiclaimed.-;

what'I claim is: a

1. A fluid transmissionvincluding'a' fluid a casing forming a part of a driven device and a power shaft-extending into the casing co'ncentricallythereof; said casing having and eccentrically locatedfchamberin] which thej;

shaft is eccentrically located,- a rotary ele-' drive element secured" to the; shaftpwings pivoted to the drive element to successively ment engagingtheLWaIIJ-ofv said chamber; :a p Q engage the rotary element during the rota-2 tion of the drive element, and a fluid control meansto traprfluid between the walls of the Casing m the aft through the rotary element. i a a chamber and certain. of'a pair of wings to buildup desired pressures for rotating the 2. A fluid "tra on iililuding and a power shaft extending; into the casing a ng o g p drilen device 126 concentricallyfi thereof,- said jcasing having an eccentricallyv located chamber in which p a the shaft is eccentrically located,-a rotary 4 element engagingtheswalls of saidchamber and having relativelyispaced grooves,' a drive element secured to thejshaft, Wings pivoted to-thedrive element to successively of the rotary element during the rotation of the drive element,;a, controlvalve'to trap-- engage withtheir free ends in the grooves fluid betw'een'the walls of the chamber, and a pairo'f wings tobfuild up varying pressuresof fluid for rotating the casing from thelshaft, through the, rotary element at variable vspeeds ofxrotation relative .tov th speed of rotation of the shaft. 1 r 3.. A -fiuid transmission. including a fluid casing forming apart of ad'riven device and a power shaft extending into the casing concentrically thereof, 'said casing having an 1 eccentrically. located chamber in which the shaft isflconcentrically located, an annular element located insaid-chamber and having relatively spaced notches in its inner -face,' anti-friction means between the wall Y 4 of theohamber and the annular element, a cylindrical drive element secured to-the shaft and having relatively spaced: ports in the periphery thereof, wings pivoted to the periphery of said cylindrical element and having thepivoted ends thereof located between said ports,- saidrw'ings adapted to closeithe ports'when. in: one position and when inanother position toengage the notches of the annular element, and "afiuid control means for the ports to trap fluid betweenthe walls of the chamberand certain of a pair of wings to build up desired pressures lfor ro tating the casing fromuthe shaft through said cylindrical elementr I T In testimony whereof I a GEORGEEUGE'NEZ or i csf'

I aflix rny ei nature. 

